GitLab

Move the various GetCurrentFormFactor functions to the
VariationsServiceClient class.

BUG=b:177442621
TEST=autoninja -C out/Default/ components:components_unittests &&
xvfb-run ./out/Default/components_unittests
--gtest_filter=FieldTrialUtilTest.*

Change-Id: Ib677ed6cfbba91a287cb5c9ef06cf96332e4be3f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2633426
Auto-Submit: Kyle Williams <kdgwill@chromium.org>
Commit-Queue: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Cr-Commit-Position: refs/heads/master@{#844656}